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4 vulnerabilities by Python-Markdown
CVE-2019-25781 (GCVE-0-2019-25781)
Vulnerability from nvd – Published: 2026-10-29 13:08 – Updated: 2026-10-29 13:08
VLAI
EPSS
VEX
Title
Python-Markdown 3.0 through 3.11.2 Denial of Service via Link Bracket Parsing
Summary
Python-Markdown 3.0 through 3.11.2 contains an algorithmic complexity vulnerability in inline link parsing that allows remote attackers to exhaust CPU through unmatched brackets. Attackers can submit short Markdown containing repeated [ or ![ characters, forcing LinkInlineProcessor.getText() and getLink() into quadratic scans that keep workers busy for minutes.
Severity
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/Python-Markdown/markdown/issues/798 | issue-tracking |
| https://github.com/Python-Markdown/markdown | product |
| https://github.com/Python-Markdown/markdown/issues/1654 | issue-tracking |
| https://github.com/Python-Markdown/markdown/blob/… | technical-description |
| https://www.vulncheck.com/advisories/python-markd… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Python-Markdown | Markdown |
Affected:
3.0 , ≤ 3.11.2
(custom)
cpe:2.3:a:python-markdown2_project:python-markdown2:*:*:*:*:*:*:*:* |
Date Public
2019-03-06 00:00
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CVE-2025-69534 (GCVE-0-2025-69534)
Vulnerability from nvd – Published: 2026-03-05 00:00 – Updated: 2026-09-07 12:05
VLAI
EPSS
VEX
Summary
Python-Markdown version 3.8 contain a vulnerability where malformed HTML-like sequences can cause html.parser.HTMLParser to raise an unhandled AssertionError during Markdown parsing. Because Python-Markdown does not catch this exception, any application that processes attacker-controlled Markdown may crash. This enables remote, unauthenticated Denial of Service in web applications, documentation systems, CI/CD pipelines, and any service that renders untrusted Markdown. The issue was acknowledged by the vendor and fixed in version 3.8.1. This issue causes a remote Denial of Service in any application parsing untrusted Markdown, and can lead to Information Disclosure through uncaught exceptions.
Severity
7.5 (High)
8.2 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-12 16:17 UTC
Assigner
References
20 references
Impacted products
27 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 8 |
Unaffected:
0:3.10.2-1.el8ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el8 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 9 |
Unaffected:
0:3.10.2-1.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 |
Unaffected:
0:4.7.11-2.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 |
Unaffected:
0:3.10.2-1.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:3.5.1-6.el10_2.1 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:3.5.1-6.el10_0.1 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:3.3.4-4.el9_8.2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support |
Unaffected:
0:3.3.4-4.el9_4.2 , < *
(rpm)
cpe:/o:redhat:rhel_eus:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:3.3.4-4.el9_6.2 , < *
(rpm)
cpe:/o:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat Satellite 6.16 for RHEL 8 |
Unaffected:
0:3.8.2-1.el8pc , < *
(rpm)
cpe:/a:redhat:satellite:6.16::el8 cpe:/a:redhat:satellite_capsule:6.16::el8 |
|
| Red Hat | Red Hat Satellite 6.16 for RHEL 9 |
Unaffected:
0:3.8.2-1.el9pc , < *
(rpm)
cpe:/a:redhat:satellite:6.16::el9 cpe:/a:redhat:satellite_capsule:6.16::el9 |
|
| Red Hat | Red Hat Satellite 6.17 for RHEL 9 |
Unaffected:
0:3.8.2-1.el9pc , < *
(rpm)
cpe:/a:redhat:satellite:6.17::el9 cpe:/a:redhat:satellite_capsule:6.17::el9 |
|
| Red Hat | Red Hat Satellite 6.18 for RHEL 9 |
Unaffected:
0:3.8.2-1.el9pc , < *
(rpm)
cpe:/a:redhat:satellite:6.18::el9 cpe:/a:redhat:satellite_capsule:6.18::el9 |
|
| Red Hat | Red Hat Developer Hub 1.8 |
Unaffected:
1776784286 , < *
(rpm)
cpe:/a:redhat:rhdh:1.8::el9 |
|
| Red Hat | Red Hat Developer Hub 1.9 |
Unaffected:
1777903262 , < *
(rpm)
cpe:/a:redhat:rhdh:1.9::el9 |
|
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1776768939 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1776243287 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1776272253 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | External Secrets Operator for Red Hat OpenShift |
cpe:/a:redhat:external_secrets_operator:1
|
|
| Red Hat | Multicluster Engine for Kubernetes |
cpe:/a:redhat:multicluster_engine
|
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenShift Dev Spaces |
cpe:/a:redhat:openshift_devspaces:3
|
|
| Red Hat | Red Hat Satellite 6 |
cpe:/a:redhat:satellite:6
|
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"cpes": [
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],
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"packageName": "automation-controller",
"product": "Red Hat Ansible Automation Platform 2.6 for RHEL 9",
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"packageName": "python-markdown",
"product": "Red Hat Enterprise Linux 9.4 Extended Update Support",
"vendor": "Red Hat",
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"cpes": [
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"product": "Red Hat Enterprise Linux 9.6 Extended Update Support",
"vendor": "Red Hat",
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"product": "Red Hat Satellite 6.16 for RHEL 8",
"vendor": "Red Hat",
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"cpes": [
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"product": "Red Hat Developer Hub 1.8",
"vendor": "Red Hat",
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},
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"cpes": [
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"product": "Red Hat Developer Hub 1.9",
"vendor": "Red Hat",
"versions": [
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"versionType": "rpm"
}
]
},
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"cpes": [
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],
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"product": "Red Hat OpenShift AI 2.25",
"vendor": "Red Hat",
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CVE-2019-25781 (GCVE-0-2019-25781)
Vulnerability from cvelistv5 – Published: 2026-10-29 13:08 – Updated: 2026-10-29 13:08
VLAI
EPSS
VEX
Title
Python-Markdown 3.0 through 3.11.2 Denial of Service via Link Bracket Parsing
Summary
Python-Markdown 3.0 through 3.11.2 contains an algorithmic complexity vulnerability in inline link parsing that allows remote attackers to exhaust CPU through unmatched brackets. Attackers can submit short Markdown containing repeated [ or ![ characters, forcing LinkInlineProcessor.getText() and getLink() into quadratic scans that keep workers busy for minutes.
Severity
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/Python-Markdown/markdown/issues/798 | issue-tracking |
| https://github.com/Python-Markdown/markdown | product |
| https://github.com/Python-Markdown/markdown/issues/1654 | issue-tracking |
| https://github.com/Python-Markdown/markdown/blob/… | technical-description |
| https://www.vulncheck.com/advisories/python-markd… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Python-Markdown | Markdown |
Affected:
3.0 , ≤ 3.11.2
(custom)
cpe:2.3:a:python-markdown2_project:python-markdown2:*:*:*:*:*:*:*:* |
Date Public
2019-03-06 00:00
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CVE-2025-69534 (GCVE-0-2025-69534)
Vulnerability from cvelistv5 – Published: 2026-03-05 00:00 – Updated: 2026-09-07 12:05
VLAI
EPSS
VEX
Summary
Python-Markdown version 3.8 contain a vulnerability where malformed HTML-like sequences can cause html.parser.HTMLParser to raise an unhandled AssertionError during Markdown parsing. Because Python-Markdown does not catch this exception, any application that processes attacker-controlled Markdown may crash. This enables remote, unauthenticated Denial of Service in web applications, documentation systems, CI/CD pipelines, and any service that renders untrusted Markdown. The issue was acknowledged by the vendor and fixed in version 3.8.1. This issue causes a remote Denial of Service in any application parsing untrusted Markdown, and can lead to Information Disclosure through uncaught exceptions.
Severity
7.5 (High)
8.2 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-12 16:17 UTC
Assigner
References
20 references
Impacted products
27 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 8 |
Unaffected:
0:3.10.2-1.el8ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el8 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 9 |
Unaffected:
0:3.10.2-1.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 |
Unaffected:
0:4.7.11-2.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 |
Unaffected:
0:3.10.2-1.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:3.5.1-6.el10_2.1 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:3.5.1-6.el10_0.1 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:3.3.4-4.el9_8.2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support |
Unaffected:
0:3.3.4-4.el9_4.2 , < *
(rpm)
cpe:/o:redhat:rhel_eus:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:3.3.4-4.el9_6.2 , < *
(rpm)
cpe:/o:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat Satellite 6.16 for RHEL 8 |
Unaffected:
0:3.8.2-1.el8pc , < *
(rpm)
cpe:/a:redhat:satellite:6.16::el8 cpe:/a:redhat:satellite_capsule:6.16::el8 |
|
| Red Hat | Red Hat Satellite 6.16 for RHEL 9 |
Unaffected:
0:3.8.2-1.el9pc , < *
(rpm)
cpe:/a:redhat:satellite:6.16::el9 cpe:/a:redhat:satellite_capsule:6.16::el9 |
|
| Red Hat | Red Hat Satellite 6.17 for RHEL 9 |
Unaffected:
0:3.8.2-1.el9pc , < *
(rpm)
cpe:/a:redhat:satellite:6.17::el9 cpe:/a:redhat:satellite_capsule:6.17::el9 |
|
| Red Hat | Red Hat Satellite 6.18 for RHEL 9 |
Unaffected:
0:3.8.2-1.el9pc , < *
(rpm)
cpe:/a:redhat:satellite:6.18::el9 cpe:/a:redhat:satellite_capsule:6.18::el9 |
|
| Red Hat | Red Hat Developer Hub 1.8 |
Unaffected:
1776784286 , < *
(rpm)
cpe:/a:redhat:rhdh:1.8::el9 |
|
| Red Hat | Red Hat Developer Hub 1.9 |
Unaffected:
1777903262 , < *
(rpm)
cpe:/a:redhat:rhdh:1.9::el9 |
|
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1776768939 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1776243287 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1776272253 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | External Secrets Operator for Red Hat OpenShift |
cpe:/a:redhat:external_secrets_operator:1
|
|
| Red Hat | Multicluster Engine for Kubernetes |
cpe:/a:redhat:multicluster_engine
|
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenShift Dev Spaces |
cpe:/a:redhat:openshift_devspaces:3
|
|
| Red Hat | Red Hat Satellite 6 |
cpe:/a:redhat:satellite:6
|
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"cpes": [
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],
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"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat",
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"cpes": [
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"product": "Red Hat Enterprise Linux 9.4 Extended Update Support",
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